Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6f4fa5e0cde9
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #31511 from ypwalter/fix_dialerAgent2

Bug 1197079 - [Attention Window Manager] DialerAgent needed to be exposed

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https://hg.mozilla.org/integration/gaia-central/rev/241d320536f2
Author: Walter C <wachen@mozilla.com>
Desc: expose DialerAgent out

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "7aa006320e8a96dceadf106fca4f5d3c9476f923", 
+        "git_revision": "7d394d6bdb17a007ec773ce25ca0c81ab196e203", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "404900062a1ee0ccdc324886ce6ead1de09d4308", 
+    "revision": "6f4fa5e0cde988b81f68ca73def82ed5f7b5c971", 
     "repo_path": "integration/gaia-central"
 }